NOTE: As their name suggests hints are not exactly Army of Two: The 40th Day cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Army of Two: The 40th Day even more entertaining.

Trophies
Complete each requirement to receive the Trophies.

Not What I Thought It Was(Bronze): Complete Chapter 1 on any difficulty level
A Steep Descent(Bronze): Complete Chapter 2 on any difficulty level
A Decent Animal (Bronze): Complete Chapter 3 on any difficulty level
Emergency Room (Bronze): Complete Chapter 4 on any difficulty level
Gone Shopping (Bronze): Complete Chapter 5 on any difficulty level
Meat Bag (Bronze): Use 15 enemies as human shields
Chaaaaarge! (Bronze): Charge through 20 enemies
Grenadier (Bronze): Kill 3 or more enemies with a single grenade
Pistolier (Bronze): Kill 150 enemies with pistols
Old Faithful (Bronze): Kill 400 enemies with assault rifles, submachine guns or shutguns
One Shot, One Kill (Bronze): Kill 100 enemies with a sniper rifle
Quick Draw (Bronze): Kill 25 enemies with a quickdraw from mock surrender
Open Hand Slap! (Bronze): Kill 50 enemies with a melee or bayonet
Not So Bad After All (Bronze): Tie up 15 enemy combatants instead of executing them
Healer (Bronze): Heal your partner 10 times
Co-Op Sniper (Bronze): Co-op snipe 5 enemies
Attention Grabber (Bronze): Allow your partner to snipe 5 guys while in mock surrender
In Synch (Bronze): Kill two enemies with simultaneous quick draws while in co-op mock surrenderPumpkin Patch (Bronze): Shoot 2 enemies in the head with a single bullet
Total Fist Bump Destruction (Bronze): Finish the game as best friends
Total Fist Bump Deflation (Bronze): Finish the game in a fractured friendship
The Truth Is Right Here (Bronze): Listen to all of the radio broadcasts
Loot and Pillage (Bronze): Collect $1,000,000
Hate Monger (Bronze): Customize a primary weapon to high aggro
The Optimist (Bronze): Make a positive coop morality choice
The Pessimist (Bronze): Make a negative coop choice
Fresh Meat: Versus (Bronze): Revive your partner and perform a partner reload during the same public match
Fancy Meeting You Here: Versus (Bronze): Invite a friend before joining a lobby to play a public match
Big Game Hunting: Versus (Bronze): Kill both members of a single partnership during a public match
Job Seeker: Versus (Bronze): In public matches, kill a player with either the primary or secondary weapon from every weapon kit
DIY PMC: Versus (Bronze): Create a custom facemask online (www.armyoftwo.com) and wear it in a public match
Death Dealer: Versus (Bronze): Kill 10 players on a single map in a public match
Power Couple: Versus (Bronze): Earn the highest partnership score in a Co-op Deathmatch, Control or Warzone public match
All Guns Blazing: Versus (Bronze): Kill a player with every weapon, including special weapons, in public matches
Survivor? (Silver): Complete the game on any difficulty level
Softcore (Silver): Complete half the game on hardest difficulty
Unbreakable (Silver): Survive an entire level without needing to be revived on normal difficulty or above
Full Arsenal (Silver): Collect all weapons and weapon parts
Touch Not A Cat But A Glove (Silver): Shoot all Maneki Neko cats in the game
Humanist (Silver): Save every hostage
Future Visions (Silver): Unlock all potential futures
Bound For Life: Versus (Silver): In a public match, survive an entire Extraction map without suffering a single death on your team
King Of The Hill: Versus (Silver): Win a public match on every map in Co-op Deathmatch, Control and Warzone
Survival Of The Fittest: Versus (Silver): Complete all 16 rounds of an Extraction game in a public match
Hardcore (Gold): Complete the game on the hardest difficulty
The Beast (Gold): Kill 6,666 people in Campaign
Better Than Gold (Platinum): Earn all other trophies

Secret Trophies:

Secret Trophy: Continue to play to unlock this secret trophy.
Secret Trophy: Continue to play to unlock this secret trophy.
Secret Trophy: Continue to play to unlock this secret trophy.
Secret Trophy: Continue to play to unlock this secret trophy.

Chapters of Deceit DLC Trophies
Complete a requirement to receive a Trophy. There are 6 Bronze Trophies and 2 Silver Trophies.

Can It Really Be That Simple? (Bronze): Kill the FDI leader. Could it really be this easy?
Good Fellas (Bronze): Negative morality choice. Choose to execute the woman
Good Guys (Bronze): Positive morality choice. Choose to let the traitor live.
Hit And Miss (Silver): Complete Chapter 8 on any difficulty level
Men of the People (Bronze): Escort all hostages to safety
Paging Dr. Wu (Bronze): Protect Dr. Wu from the FDI foes
Pick A New Face (Bronze): Find one new mask in The Chapters of Deceit
Train Wrecked (Silver): Complete chapter 9 on any difficulty level

Cheat Codes
Upon completing the game for the first time on any difficulty, cheat codes will become available in the options menu. (Note: while active, cheats may block trophies)

Big-Head mode: Complete game once
Infinite Ammo: Complete game once

Extra Outfits
Upon completing the game for the first time on any difficulty, several outfits will be made available to the player. You can change your current outfit at the character selection screen.

Beat-up (end game armor): Complete game once
Civilian clothes (no armor): Complete game once
Light armor: Complete game once
Mall clothes (bare armor): Complete game once
Medium armor: Complete game once
Oldschool armor (original Army of Two armor): Complete game once

Extra Weapons
In order to unlock the AS-KR1 and the SB-Z Grand Pinger, you need to have a save file from the original Army of Two. The weapons will then appear in the customization menu, the AS-KR1 costs $300,000 and the SB-Z $450,000, respectively. They are not customizable.

AS-KR1: Have an original Army of Two save file present
SB-Z Grand Pinger: Have an original Army of Two save file present

Beginning Weapons Fullly Upgraded
When you first start the game you are given money to upgrade your weapons. Upgrade your weapons/buy new ones, then continue onwards till the cutscene with the moral choice, make it. Go back to the main menu during the cutscene with the explosions, select campaign, select the one you just did. Click new. You will have all the weapons, upgrades and money from the previous mission, and can upgrade your weapons once more. Repeat till all beginning weapons are upgraded/bought.